多电平变换器PWM控制技术发展现状

Development of PWM Control Technology in Multilevel Converters

多电平PWM控制技术一直是多电平变换器研究的核心内容之一。基于传统两电平PWM技术研究的经验,经过近十几年的发展,多电平PWM控制技术已形成了几类不同的实现方法,同时新的控制方法还在涌现。与两电平相比,多电平PWM方法需要面对一些新出现的问题,并拓展PWM控制的内涵,进而形成新的PWM控制思路。按照目前的发展情况,多电平PWM控制方法一般有多电平载波PWM方法、多电平空间矢量PWM方法,以及其他优化的PWM方法。本文对已有多电平PWM控制技术进行了归纳和分析,最后指出多电平空间矢量法和载波调制法在一定条件下具有内在的一致性。

The PWM control is the key technology in multilevel converters. Multilevel PWM control technology has developed different ways to accomplish on the basis of traditional two-level PWM methods during past decade years. Compared with two-level algorithms, multilevel PWM algorithms need to have new strategies and tackle some new problems. Generally, multilevel PWM strategies include three types of methods: multilevel Carrier PWM, multilevel Space Vector PWM and Optimal PWM. This paper gives analysis and summary to existing multilevel PWM strategies, and in special way, there are internal relations between multilevel SVM and Carrier PWM algorithms.